Dick Raynor joined the group in 1967, and on June 13th of that year, he filmed something swimming in the Loch. The "Legend of Nessie" site says:
"Another well known film is the one taken by LNIB member Dick Raynor on the 13th of June 1967. Conditions on the Loch were very good and a clear wash or wake can be seen before and after the Scot II tour boat passes into view. Raynor explains that passengers on the boat would not have seen this disturbance as they were too low to the water and it was also about half a mile away from Scot II. The objects [sic] speed was estimated to be about 2.2 meters per second. This film offers creditable proof of some large animal living in Loch Ness and was agreed by many experts to be an authentic and convincing series of shots."
You can watch part of the film below. The full thing (which I cannot find on YouTube) is about two minutes.
Raynor and others did not actually see the film until the LNPIB's delayed Christmas party which took place on January 4, 1968. It was rated alongside Tim Dinsdale's film as best evidence for the monster at that time.
It is my opinion that Raynor actually filmed something that would fall under the label of a "Loch Ness Monster." What do you think?